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PERMFILE109060
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PERMFILE109060
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Last modified
8/24/2016 10:01:32 PM
Creation date
11/24/2007 5:46:24 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1992080A
IBM Index Class Name
Permit File
Doc Date
7/8/2004
Section_Exhibit Name
Section 2.05 Operation and Reclamation Plans
Media Type
D
Archive
Yes
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Design Volume Calculations -Lower Sump <br />Area Drainage Area (acres) 1.13 <br />Design Event 100 yr. Storm <br />Design Precipitation 3.2 <br />Average CN 89 <br />Calculated S 1.23595505618 <br />Description Exposed gravel and rocky soil <br />Calculated Runoff Volume (Q) 2.08 <br />Calculated Runoff Volume (acre-ft.) 0.20 <br />Ponding Percentage 5.00 <br />Actual Runoff Volume (acre/ft.) 0.19 <br />As shown on the Hydrology Map, this sump will have the design capacity of .22 acre feet allowing <br />for extra volume for sediment storage. Collection ditches will be installed that direct water from the <br />disturbed areas into the sump. These ditches will be v-ditches of at least 1.0 feet deep and <br />2.OH:1.OV sideslopes. No lining will be employed since the grades are mild and they aze leading to <br />sediment sumps. <br />Alternative Sediment Control (SAE) Topsoil Stockpile # 2 <br />Once topsoil is removed from this stockpile and while the area is final-graded, a berm of 24" height <br />will be placed around the former pile azea (2.69 acres) to prevent erosion from the area. This berm <br />will be placed with a small dozer and will have 2H:1 V sideslopes. Once final bond release is <br />granted, this berm will be regraded into the surrounding terrain. <br />Stream Channel Reconstruction (Carbon Junction Canyon) <br />Carbon Junction Canyon will be reconstructed and permanently diverted as detailed below. The <br />work involves a diversion of 1962 feet that will be riprap lined and will have one culvert crossing under the <br />main access road. The channel itself will be 14' wide after lining and varies in depth from l.9 feet to 2.8 feet <br />for segment 6, including freeboard. <br />Technical Revision to Appendices 5-9 and 5-10 of this coal permit shows that the peak flow for the <br />upper segment (above the junction with the mine access road) is 346 cfs for the 100 year event for a <br />drainage area of 188 acres. This was verified to be con•ect. This flow was used to design the <br />diversion channel. <br />TR09, TRl l 5-8 Revised 3/98, 8/02 <br />
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